The concentrated buying by Assenagon (93% of net inflow) makes this a single-manager-driven signal rather than broad consensus. Monitor upcoming 13F filings to see if other large active managers follow, and watch for any Q4 2026 insider buying to corroborate the thesis.
Executive Summary
Seven institutional asset managers accumulated $154.8M in net new Roblox Corp (RBLX) positions during Q3 2026, while only two trimmed by a combined $4.9M. The buying is heavily concentrated in Assenagon Asset Management, which more than doubled its stake to $253.9M, accounting for the vast majority of the net inflow. The cluster is entirely active asset managers with no passive/index fund participation, strengthening the signal of a shared thesis.
Key Financial Metrics
Institutional Positions
Net institutional flow: $154.8M
▲ Buyers (7)
| Institution | Action | Change | Position Value | Value Δ |
|---|---|---|---|---|
| Assenagon Asset Management | DOUBLED | +216.4% | $253.9M | $150.9M |
| Wealth Enhancement Advisory Services | ADD | +45.3% | $10.8M | $1.7M |
| Vontobel Holding | ADD | +68.8% | $4.4M | $1.1M |
| Hb Wealth Management | DOUBLED | +152.2% | $2.1M | $1.0M |
▼ Sellers (2)
| Institution | Action | Change | Prev Value | Value Δ |
|---|---|---|---|---|
| Pensiondanmark Pensionsforsikringsaktieselskab | TRIM | -25% | $7.1M | -$2.9M |
| Assetmark | NEAR_EXIT | -92.3% | $2.1M | -$1.9M |
Key Facts
- 7 institutional buyers added $154.8M in net new RBLX positions during Q3 2026
- Assenagon Asset Management doubled its stake by $150.9M to $253.9M, representing 93% of total buying
- Only 2 sellers trimmed a combined $4.9M, with Assetmark exiting 92.3% of its position
- All participants are active asset managers; no passive/index funds in the cluster
- 13F data is as of September 30, 2026 — positions may have changed since filing
Financial Impact
7 institutions accumulated $154.8M in net new RBLX positions (total current holdings $273.9M) while 2 sellers reduced by $4.9M
Risk Factors
- 13F data is 45+ days stale — the cluster may have been partially or fully unwound since quarter-end
- Single-manager concentration (Assenagon) means the signal is not diversified across many independent thesis-holders
- No insider buying or other corroborating signals in the provided context
Investment Themes
Documents Analyzed
This report is based on 1 institutional 13F filing from SEC EDGAR.
| Document | Accession Number |
|---|---|
| INST-CLUSTER Data (Synthetic) | inst-cluster-RBLX-2026-Q3 |
Filters
| Type | Now | ||||
|---|---|---|---|---|---|
Oct 23, 2026 3d ago | Institutional Cluster | $52.89 | awaiting T+20 | — | — |
Sep 9, 2026 6w ago | Insider Cluster | $44.88 $45.52 | ▲ +1.43% | ▼ −0.70% | — |
Sep 2, 2026 7w ago | Insider Cluster | $41.51 $44.12 | ▲ +6.29% | ▲ +7.47% | — |
Sep 1, 2026 7w ago | Insider Cluster | $41.21 $43.00 | ▲ +4.34% | ▲ +4.50% | — |
Aug 26, 2026 8w ago | Insider Cluster | $38.15 $48.83 | ▲ +27.99% | ▲ +28.50% | — |
Aug 25, 2026 8w ago | Insider Cluster | $37.56 $48.83 | ▲ +30.01% | ▲ +29.86% | — |
Aug 24, 2026 9w ago | Insider Cluster | $39.12 $48.99 | ▲ +25.23% | ▲ +24.98% | — |
Jul 7, 2026 15w ago | Insider Cluster | $55.12 $36.19 | ▼ −34.34% | ▼ −37.62% | — |
May 27, 2026 21w ago | Insider Cluster | $46.83 $47.56 | ▲ +1.56% | ▲ +4.70% | — |
May 27, 2026 21w ago | Insider Cluster | $47.00 $54.38 | ▲ +15.70% | ▲ +17.00% | — |
US Market Status
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